au.edu.uts.eng.remotelabs.schedserver.dataaccess.dao.ConfigDao.java Source code

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/**
 * SAHARA Scheduling Server
 *
 * Schedules and assigns local laboratory rigs.
 *
 * @license See LICENSE in the top level directory for complete license terms.
 *
 * Copyright (c) 2010, University of Technology, Sydney
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of the University of Technology, Sydney nor the names 
 *    of its contributors may be used to endorse or promote products derived from 
 *    this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @author Michael Diponio (mdiponio)
 * @date 7th January 2010
 */
package au.edu.uts.eng.remotelabs.schedserver.dataaccess.dao;

import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.criterion.Restrictions;

import au.edu.uts.eng.remotelabs.schedserver.dataaccess.entities.Config;

/**
 * Data access object for the {@link Config} class.
 */
public class ConfigDao extends GenericDao<Config> {
    /**
     * Constructor that opens a new session.
     * 
     * @throws IllegalStateException if a session factory cannot be obtained
     */
    public ConfigDao() {
        super(Config.class);
    }

    /**
     * Constructor that uses the provided session. The session must be 
     * not-null and open.
     * 
     * @param ses open session
     * @throws IllegalStateException if the provided use session is null or
     *         closed
     */
    public ConfigDao(Session ses) {
        super(ses, Config.class);
    }

    /**
     * Creates a config record with the specified key and value. Returned 
     * is the persistent config object.
     * 
     * @param key configuration key
     * @param value configuration value
     * @return persistent config
     */
    public Config create(String key, String value) {
        Config config = new Config(key, value);

        this.begin();
        this.session.saveOrUpdate(config);
        this.commit();

        return config;
    }

    /**
     * Returns the configuration values with the specified configuration key.
     * 
     * @param key configuration key
     * @return list of matching configuration values
     */
    @SuppressWarnings("unchecked")
    public List<Config> getConfig(String key) {
        Criteria crit = this.session.createCriteria(this.clazz);
        crit.add(Restrictions.eq("key", key));
        return crit.list();
    }
}